What decimal number is represented by the shaded portion of the model?

Answer:
0.57
Step-by-step explanation:
Step 1: Count the total amount of squares
10 by 10 square, so 100 squares in total
Step 2: Count how many rows have been filled
5 rows of 10, so 50 out of 100, or 0.50
Step 3: Count the rest
7 out of 100, so 0.07
Step 4: Add
0.07 + 0.50 = 0.57